UITapGestureRecognizer
탭(몇번이든)
UIPinchGestureRecognizer
(두손가락으로 집어 벌리기 오므리기)
UIPanGestureRecognizer
Panning or dragging
UISwipeGestureRecognizer
넘기기 (어떤 방향이든)
UIRotationGestureRecognizer
Rotating (fingers moving in opposite directions)
UILongPressGestureRecognizer
길게누르기
